> On Feb 12, 2018, at 12:10 PM, flymike <m...@thosehallidays.org> wrote:
> I have a requirement to deliver via 'X' when sender = 'A' /and/ recipient =
> 'B', else deliver via configured defaults.
> I see how I could use sender_dependent_default_transport_maps to set nexthop
> to 'X' when sender = 'A' but I still need to deal with the additional
> condition that recipient = 'B'.
> It's like I need multiple transport tables, dependent upon sender.
> Is there any way to fulfill this requirement within the postfix framework?

Not within a single Postfix instance.  With multiple instances (and much
complexity) you could use "sender A" select a different downstream instance,
where B is routed to the desired transport.  This scales poorly, but if the
exceptions are few enough, and the need great, then you can do it.

Another option is to use a proxy filter, or milter to rewrite B to some
special recipient address B' when the sender is A, then route B' to a
custom nexthop, and use smtp_generic_maps to transform B' back to B
on output.  This works in a single Postfix instance with a proxy filter
or milter.


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